Under Salt Marsh is a British crime thriller television series created by Claire Oakley and starring Kelly Reilly and Rafe Spall in the lead roles. Filmed in Wales, the series is set in the fictional North Wales village of Morfa Halen. The series premiered on 30 January 2026 on Sky Atlantic. In August 2026, it was renewed for a second series.
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Premise
As a huge storm starts to form far out at sea, Jackie Ellis, a teacher and former detective, finds the body of her 8-year-old student, Cefin Hill, who appears to have drowned. This shocking discovery stirs up the town's memories of an unresolved case from three years earlier: the disappearance of Jackie's niece, Nessa. The failure to find the girl cost Ellis her police career.
Cefin's death brings back Jackie's former partner, Detective Eric Bull, to lead the investigation in a community where he had previously failed. Believing the two cases are connected, Ellis and Bull must work together to uncover hidden secrets in Morfa Halen before the storm hits and wipes away any evidence.